<span>The border between California and Oregon is a thin, black line; this indicates a state boundary.
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Silk, common currency, fireworks.
Those are the main three I know of.
They both are required to apply and enforce the laws.
The differences between the two are in the jurisdictions. The jurisdiction on federal court is not as elaborate as state courts.
The Epic of Gilgamesh is one of the oldiest stories that has been written in the history of mankind; oldest preserved stories at least. It was written on clay tablets which are to some extent still preserved today. And this is a feat which has immeasurable value considering what we can learn from it.